Lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wallboard and preparation method thereof

Abstract

The invention discloses a lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wallboard and a preparation method thereof, and belongs to the technical field of building wallboards. The wallboard comprises an outer panel, an inner panel, a sandwich layer between the outer panel and the inner panel, and bonding layers respectively connected with the inner panel, the outer panel and the sandwich layer, the sandwich layer is composed of a double-layer 8-shaped glass fiber three-dimensional fabric and alkali-activated foam concrete filled in a gap of the double-layer 8-shaped glass fiber three-dimensional fabric. According to the wallboard, the double-layer 8-shaped glass fiber three-dimensional fabric serves as an internal frame, strong supporting is achieved in all directions, relative slippage between fibers is reduced, and therefore the overall structural stability of the three-dimensional fabric is improved, and the strength, rigidity and impact resistance of the fabric are enhanced; and alkali-activated foam concrete is filled, so that the weight of the wallboard is reduced, meanwhile, the requirements of bearing capacity and durability are met, and after the wallboard is bonded with the inner panel and the outer panel, the heat insulation effect of the product can be effectively exerted.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and in particular relates to a lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wallboard and a preparation method thereof. Background Art

[0002] Whether used as a load-bearing structure or a non-load-bearing structure, concrete wall panels need to meet the basic requirements of being strong, durable, fireproof, waterproof, and environmentally friendly. At the same time, in order to meet the requirements of thermal insulation of building walls, composite materials such as foam concrete and glass fiber related products can be considered for building wall panel materials.

[0003] Foamed concrete usually refers to a lightweight material containing a large number of closed pores formed by mechanically foaming the foaming agent and foaming materials through the foaming system of the foaming machine, and mixing the foam with the cementitious material and other materials in a certain proportion, and then pouring and naturally curing. Adding multi-component chopped fibers can improve the toughness and strength of the product. Give full play to the performance of different fibers themselves to improve the various mechanical properties, durability and high temperature resistance of foamed concrete. Although ordinary foamed concrete has the advantages of light weight, good impact resistance, environmental protection and economy, its shrinkage is much greater than that of ordinary concrete due to its high porosity and lack of coarse aggregate. Large shrinkage can easily lead to "collapse" after the foamed concrete is poured, and it can also easily lead to the formation of microcracks inside the foamed concrete, which can lead to problems such as cracking and low strength of the material.

[0004] In the prior art, a Chinese patent discloses a lightweight composite wall panel based on fabric and GFRP three-dimensional grid reinforcement (publication number CN213897664U), including two surface layers and a foam concrete sandwich layer filled between the two surface layers, and also includes a connector for connecting the two surface layers and the sandwich layer, the connector includes a plurality of GFRP bars and a plurality of GFRP hoops, the GFRP bars are symmetrically arranged in the two surface layers, and the GFRP hoops penetrate the foam concrete sandwich layer and are fixedly connected to the GFRP bars in the two surface layers to form a three-dimensional grid. The lightweight composite wall panel can not only improve the strength of the foam concrete in the sandwich layer by setting a three-dimensional grid-shaped connector, but also reduce the shrinkage strain of the foam concrete, increase the connection strength between the surface layer and the sandwich layer, and improve the overall bearing capacity of the sandwich layer material, thereby improving the overall shear strength of the composite wall panel. However, the realization of the effect of the lightweight composite wall panel only relies on the improvement of the connector, and there is no substantial improvement on the sandwich layer, so the effect is poor and needs to be further improved. In particular, the overall weight is still relatively large, and the pouring and transportation at the construction site consume a lot of manpower and material resources, which brings inconvenience and limitations to the construction. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies of the prior art and provide a lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite wall panel and a preparation method thereof. The glass fiber three-dimensional fabric alkali-activated foam composite wall panel is lightweight, high-strength, heat-insulating, environmentally friendly and durable.

[0006] The technical solutions adopted by the present invention to achieve the above-mentioned purpose are as follows.

[0007] The present invention provides a lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wallboard, comprising an outer panel, an inner panel, a sandwich layer between the outer panel and the inner panel, and an adhesive layer respectively connecting the inner panel, the outer panel and the sandwich layer;

[0008] The sandwich layer is composed of glass fiber three-dimensional fabric and alkali-activated foam concrete filled in the gaps of the glass fiber three-dimensional fabric. The glass fiber three-dimensional fabric is a double-layer 8-shaped glass fiber three-dimensional fabric. The glass fiber used in the glass fiber three-dimensional fabric is alkali-resistant glass fiber.

[0009] Preferably, the outer panel and the inner panel are made of ecological boards respectively, and the materials of the outer panel and the inner panel are different; more preferably, the ecological board is a bamboo fiberboard or a magnesium straw ecological board.

[0010] Preferably, the thickness of the outer panel and the inner panel is 9-12 mm respectively.

[0011] Preferably, the material of the adhesive layer is polyurethane adhesive; more preferably, the polyurethane adhesive is polyurethane emulsion glue.

[0012] Preferably, the thickness of the adhesive layer is 2-5 mm.

[0013] Preferably, the thickness of the sandwich layer is 45-50 mm.

[0014] Preferably, the glass fiber three-dimensional fabric is composed of three layers of parallel glass fiber cloth and a plurality of core yarns, the core yarns are fixedly connected to two adjacent layers of glass fiber cloth, and the core yarns between the two adjacent layers of glass fiber are evenly distributed, the glass fiber cloth is woven by warp yarns and weft yarns, and the core yarns are in an 8-shape along the weft direction and in a 1-shape along the warp direction;

[0015] More preferably, the distance between two adjacent core yarns is 4-5 mm.

[0016] Preferably, the glass fiber three-dimensional fabric is integrally formed.

[0017] Preferably, the glass fiber three-dimensional fabric is pre-shaped by using polyurethane resin.

[0018] Preferably, the raw materials of the alkali-activated foamed concrete include: foam and mortar;

[0019] The volume of the foam accounts for 25%-30% of the total volume of the alkali-activated foam concrete, the bubble size of the foam is 0.5-1.0 mm, and the density of the foam is 80-100 kg / m 3 The bulk density of alkali activated foam concrete is 135-150kg / m 3 ;

[0020] The mortar consists of 4wt%-6wt% of sodium hydroxide, 9wt%-12wt% of water glass, 52wt%-58wt% of sand, 10wt%-15wt% of fly ash, 14wt%-18wt% of slag and 5wt%-11wt% of water.

[0021] The present invention also provides a method for preparing the above-mentioned lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wallboard, the steps of which are as follows:

[0022] S1. Preparation of alkali activated foam concrete

[0023] S11, preparing foam according to the formula of foam concrete;

[0024] S12, stirring and mixing sodium hydroxide, water glass, sand, slag, fly ash and water to obtain mortar;

[0025] S13, adding foam to the mortar and stirring evenly to obtain alkali-activated foam concrete;

[0026] S2. Preparation of sandwich layer

[0027] S21, preparing glass fiber three-dimensional fabric;

[0028] S22, stretching both sides of the glass fiber three-dimensional fabric, and applying a pre-tensioning force of 10%-15% of the ultimate tensile bearing capacity of the glass fiber three-dimensional fabric;

[0029] S23, placing the pre-tightened three-dimensional glass fiber fabric in a mold, pouring the alkali-activated foamed concrete prepared in S1, and curing for 28-35 days;

[0030] S3. Bonding inner panel, outer panel and sandwich layer

[0031] S31, applying adhesive to the surfaces of the sandwich layer, the inner panel and the outer panel, and bonding the sandwich layer between the inner panel and the outer panel, pressing and fixing them into one body;

[0032] S32, curing for 28-35 days, removing the mold after solidification and hardening, and obtaining a lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wall panel.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wall panel of the present invention uses a double-layer 8-shaped glass fiber three-dimensional fabric as an internal frame and is filled with alkali-activated foam concrete. While reducing the weight of the wall panel, it also meets the requirements of bearing capacity and durability. After being bonded to the inner panel and the outer panel, the thermal insulation effect of the product can be effectively exerted.

[0035] The lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wallboard of the present invention can provide a more uniform stress distribution and reduce the local stress concentration phenomenon due to the special weaving method of the double-layer 8-shaped glass fiber three-dimensional fabric. The double-layer 8-shaped glass fiber three-dimensional fabric has strong support in all directions, reduces the relative slip between fibers, thereby improving the overall structural stability of the double-layer 8-shaped glass fiber three-dimensional fabric, enhancing the strength and rigidity of the fabric, and can effectively disperse the impact force when subjected to force, thereby improving its impact resistance.

[0036] The lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wallboard of the present invention, the bonding strength between the double-layer 8-shaped glass fiber three-dimensional fabric and the inner panel and the outer panel mainly depends on the material of the bonding layer (as well as the surface treatment of the inner and outer panel materials and environmental conditions). The present invention preferably uses a polyurethane adhesive with a bonding strength range of 1.5-3MPa. Compared with ordinary glass fiber three-dimensional fabrics, the strength is improved. At the same time, the overall stability of the double-layer 8-shaped glass fiber three-dimensional fabric is stronger than that of ordinary glass fiber three-dimensional fabrics, so that the tensile strength of the product is improved. After experimental detection, the tensile strength of the double-layer 8-shaped glass fiber three-dimensional fabric of the present invention is generally between 600-1200MPa.

[0037] The lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wallboard of the present invention adopts the combination of alkali-resistant glass fiber and alkali-activated foam concrete, which can better improve the tensile strength of the product. Moreover, both alkali-resistant glass fiber and alkali-activated foam concrete have excellent characteristics such as environmental protection, light weight, and heat insulation. The wallboard combined with the two can better play the role of thermal insulation. In addition, the use of alkaline activators (sodium hydroxide, sodium silicate, water) also improves the rapid hardening and early strength phenomenon of the product. The alkaline activator can make the foam concrete more dense, and the compressive strength and durability are improved. At the same time, due to its good fluidity and stability, the alkali-activated foam concrete is conducive to pouring and maintenance at the construction site at any time. Its internal pore structure makes it also have good performance in heat insulation, so that the alkali-activated foam concrete has better thermal insulation. In addition, the rational use of industrial by-products (slag, fly ash) as raw materials helps to reduce the impact of these wastes on the environment and has higher environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the drawings required for use in the specific implementation modes will be briefly introduced below. Obviously, the drawings described below are only some specific implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 It is a schematic structural diagram of the lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wallboard of the present invention;

[0040] Figure 2 It is a process flow chart of the preparation method of the lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wallboard of the present invention;

[0041] In the figure, 1, outer panel; 2, adhesive layer; 3, sandwich layer; 4, glass fiber three-dimensional fabric; 5, alkali-activated foam concrete; 6, inner panel. DETAILED DESCRIPTION

[0042] In order to further understand the present invention, preferred embodiments of the present invention are described below. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0043] like Figure 1 As shown, the lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wall panel of the present invention includes an outer panel 1, an inner panel 6, a sandwich layer 3 between the outer panel 1 and the inner panel 6, and an adhesive layer 2 respectively connecting the inner panel 1, the outer panel 6 and the sandwich layer 3; wherein the sandwich layer 3 is composed of a glass fiber three-dimensional fabric 4 and an alkali-activated foam concrete 5 filled in the gaps of the glass fiber three-dimensional fabric 4, and the glass fiber three-dimensional fabric 4 is a double-layer 8-shaped glass fiber three-dimensional fabric.

[0044] In the above scheme, the materials of the outer panel 1 and the inner panel 6 are ecological boards, preferably bamboo fiber boards or magnesium straw ecological boards. The materials of the outer panel 1 and the inner panel 6 are usually different. The thickness of the outer panel 1 and the inner panel 6 is preferably 9-12 mm.

[0045] In the above solution, the thickness of the adhesive layer 2 is 2-5 mm; the material of the adhesive layer 2 is preferably polyurethane adhesive. The bonding strength of the polyurethane adhesive is in the range of 1.5-3 MPa, which can improve the tensile strength of the glass fiber three-dimensional fabric 4.

[0046] In the above scheme, the thickness of the sandwich layer 3 is preferably 45-50mm, and the thickness of each layer of the double-layer 8-shaped glass fiber three-dimensional fabric is preferably 20-30mm, and the thickness of the two layers is more preferably equal. The glass fiber three-dimensional fabric 4 is preferably integrally formed, consisting of three layers of parallel glass fiber cloth and a plurality of core column yarns, the core column yarns are fixedly connected to the two adjacent layers of glass fiber cloth, and the core column yarns between the two adjacent layers of glass fiber are evenly distributed, and the glass fiber cloth is woven from warp yarns and weft yarns, and the core column yarns are 8-shaped along the weft direction and 1-shaped along the warp direction. Due to its special weaving method, the double-layer 8-shaped glass fiber three-dimensional fabric can provide a more uniform stress distribution and reduce the local stress concentration phenomenon. The double-layer 8-shaped glass fiber three-dimensional fabric has strong support in all directions, reduces the relative slip between fibers, thereby improving the overall structural stability of the fabric, enhancing the strength and rigidity of the fabric, and can effectively disperse the impact force when subjected to force, thereby improving its impact resistance. Preferably, the glass fiber used in the glass fiber three-dimensional fabric 4 is alkali-resistant glass fiber. Preferably, the glass fiber three-dimensional fabric 4 is pre-shaped with polyurethane resin. Preferably, the distance between two adjacent core yarns is 4-5 mm.

[0047] In the above scheme, an alkaline activator is added to the alkali-activated foamed concrete 5, and no coarse aggregate is added, but fine aggregate is used instead to enhance toughness. The use of alkaline activator also improves the rapid hardening and early strength phenomenon of the product. The alkaline activator can make the foamed concrete more compact, and the compressive strength and durability are improved. At the same time, due to its good fluidity and stability, the alkali-activated foamed concrete 5 is conducive to pouring and maintenance at the construction site at any time. Its internal pore structure enables it to have better performance in heat insulation, so that the alkali-activated foamed concrete has better thermal insulation. And the rational use of industrial by-products (slag, fly ash) as raw materials helps to reduce the impact of these wastes on the environment and has higher environmental protection. The present invention provides an alkali-activated foamed concrete 5, but is not limited to this. The raw materials include: foam and mortar; the volume of the foam accounts for 25%-30% of the total volume of the alkali-activated foamed concrete, the bubble size of the foam is 0.5-1.0mm, and the density of the foam is 80-100kg / m 3 The bulk density of alkali activated foam concrete is 135-150kg / m 3 The mortar is composed of 4wt%-6wt% sodium hydroxide, 9wt%-12wt% water glass, 52wt%-58wt% sand, 10wt%-15wt% fly ash, 14wt%-18wt% slag and 5wt%-11wt% water.

[0048] like Figure 2 As shown, the preparation method of the lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wallboard of the present invention comprises the following steps:

[0049] S1. Preparation of alkali activated foamed concrete 5

[0050] S11, according to the relevant national standards for foamed concrete, determine the components and relevant proportions of foamed concrete, make foam of foamed concrete, the basic components by weight are 0.15-0.25 parts of foaming agent, 9-15 parts of water, 0.2-0.25 parts of sodium oxalate and 0.8-2.5 parts of water glass, process in a foaming machine, and prepare the foam for standby use;

[0051] S12, stirring and mixing sodium hydroxide, water glass, sand, slag, fly ash and water to obtain mortar;

[0052] S13, adding foam to the mortar and stirring evenly to obtain alkali-activated foam concrete 5;

[0053] S2. Preparation of sandwich layer 3

[0054] S21, preparing glass fiber three-dimensional fabric 4;

[0055] S22, stretching both sides of the glass fiber three-dimensional fabric 4, and applying a pre-tensioning force of 10%-15% of the ultimate tensile bearing capacity of the glass fiber three-dimensional fabric 4;

[0056] S23, placing the glass fiber three-dimensional fabric 4 after applying pre-tightening force in a mold, pouring the alkali-activated foamed concrete 5 prepared in S1, and curing for 28-35 days;

[0057] S3, bonding the inner panel 1, the outer panel 6 and the sandwich layer 3

[0058] S31, applying adhesive to the surfaces of the sandwich layer 3, the inner panel 1 and the outer panel 6, and bonding the sandwich layer 3 between the inner panel 1 and the outer panel 6, and pressing and fixing them into one body;

[0059] S32, curing for 28-35 days, removing the mold after solidification and hardening, and obtaining a lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wall panel.

[0060] It should be noted that the preparation of the glass fiber three-dimensional fabric 4 is a prior art, and those skilled in the art can prepare the corresponding glass fiber three-dimensional fabric 4 according to the structure limited by the present invention.

[0061] The terms used in the present invention generally have the meanings commonly understood by those of ordinary skill in the art, unless otherwise specified.

[0062] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with embodiments. The present invention will be further described below in conjunction with embodiments.

[0063] Example 1

[0064] The thickness of the outer panel 1 and the inner panel 6 are both 10 mm, the outer panel 1 is made of bamboo fiberboard, the inner panel 6 is made of magnesium straw ecological board, the thickness of the glass fiber three-dimensional fabric 4 is 50 mm, and the thickness of the adhesive layer 2 is 5 mm. The specific preparation method is as follows:

[0065] S1. Preparation of alkali activated foamed concrete 5

[0066] S11. Determine the composition and proportion of foamed concrete according to relevant national standards for foamed concrete;

[0067] S12, making foam of foamed concrete, the basic components are 0.15kg foaming agent, 9kg water, 0.23kg sodium oxalate, 0.8kg water glass, processed in a foaming machine, and a plant-based composite cement foaming agent (Jiukun Building Materials FP-50) is mixed with water in a mass ratio of 1:60 in the foaming pulping stage to prepare the foam for standby use;

[0068] S13, preparing mortar, using 4wt% sodium hydroxide, 10wt% water glass, 52wt% sand, 15wt% slag, 10wt% fly ash and 9wt% water as basic components, stirring and mixing evenly to obtain mortar;

[0069] S14, add the prepared foam to the mortar and mix thoroughly, stir for 120s, pour into the mold after mixing, shake and smooth, cover with plastic wrap and place in a 20±2° environment for curing, the bulk density of alkali-activated foam concrete 5 is 150kg / m 3 ;

[0070] S2. Preparation of sandwich layer 3

[0071] S21, preparing a glass fiber three-dimensional fabric 4 with a thickness of 50 mm, wherein the glass fiber three-dimensional fabric 4 is a double-layer 8-shaped glass fiber three-dimensional fabric, each layer is 25 mm thick, and the distance between two adjacent core column yarns is 5 mm;

[0072] S22, fixing the glass fiber three-dimensional fabric 4 on a stretching stand, horizontally stretching both sides of the three-dimensional fabric on the stretching stand, and applying a pre-tensioning force of 10% of the ultimate tensile bearing capacity of the glass fiber three-dimensional fabric 4 to the three-dimensional fabric;

[0073] S23, prepare a mold of 3000 mm×600 mm×90 mm, place the glass fiber three-dimensional fabric 4 with pre-tightening force applied therein, pour the alkali-activated foam concrete 5 prepared in S1, and cure for 28 days;

[0074] S3, bonding sandwich layer 3, inner panel 6, and outer panel 1

[0075] S31, apply 2.5 mm polyurethane emulsion glue on the surfaces of the sandwich layer 3, the inner panel 1 and the outer panel 6, and adhere the sandwich layer 3 between the inner panel 1 and the outer panel 6, and press and fix them into one body;

[0076] S32, curing for 28 days, removing the mold after solidification and hardening, and obtaining a lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wall panel.

[0077] Compared with ordinary foam concrete wallboards, the lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite wallboard obtained in Example 1 has improved thermal insulation effect, increased thermal resistance by 15%, and reduced air permeability by 10%. The detection method refers to GB / T 23451-2009 "Lightweight partition wall panels for construction".

[0078] Example 2

[0079] The thickness of the outer panel 1 and the inner panel 6 are both 9 mm, the outer panel 1 is made of bamboo fiberboard, the inner panel 6 is made of magnesium straw ecological board, the thickness of the glass fiber three-dimensional fabric 4 is 50 mm, and the thickness of the adhesive layer 2 is 4 mm. The specific preparation method is as follows:

[0080] S1. Preparation of alkali activated foamed concrete 5

[0081] S11. Determine the composition and proportion of foamed concrete according to relevant national standards for foamed concrete;

[0082] S12, making foam of foamed concrete, the basic components are 0.2kg foaming agent, 12kg water, 0.25kg sodium oxalate, 1.1kg water glass, processed in a foaming machine, and a plant-based composite cement foaming agent (Jiukun Building Materials FP-50) is mixed with water in a mass ratio of 1:60 in the foaming pulping stage to prepare the foam for standby use;

[0083] S13, preparing mortar, the basic components of which are 4wt% sodium hydroxide, 9wt% water glass, 52wt% sand, 14wt% slag, 11wt% fly ash and 10wt% water;

[0084] S14, add the prepared foam to the mortar and mix thoroughly, stir for 120s, pour into the mold after mixing, shake and smooth, cover with plastic wrap and place in a 20±2° environment for curing, the bulk density of alkali-activated foam concrete 5 is 135kg / m 3 ;

[0085] S2. Preparation of sandwich layer 3

[0086] S21, preparing a glass fiber three-dimensional fabric 4 with a thickness of 50 mm, wherein the glass fiber three-dimensional fabric 4 is a double-layer 8-shaped glass fiber three-dimensional fabric, each layer is 25 mm thick, and the distance between two adjacent core column yarns is 5 mm;

[0087] S22, fixing the glass fiber three-dimensional fabric 4 on a stretching stand, horizontally stretching both sides of the three-dimensional fabric on the stretching stand, and applying a pre-tensioning force of 10% of the ultimate tensile bearing capacity of the glass fiber three-dimensional fabric 4 to the three-dimensional fabric;

[0088] S23, prepare a mold of 3000 mm×600 mm×90 mm, place the glass fiber three-dimensional fabric 4 with pre-tightening force applied therein, pour the alkali-activated foam concrete 5 prepared in S1, and cure for 28 days;

[0089] S3, bonding sandwich layer 3, inner panel 6, and outer panel 1

[0090] S31, apply 2mm polyurethane latex glue on the surfaces of the sandwich layer 3, the inner panel 1 and the outer panel 6, and adhere the sandwich layer 3 between the inner panel 1 and the outer panel 6, and press and fix them into one;

[0091] S32, curing for 28 days, removing the mold after solidification and hardening, and obtaining a lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wall panel.

[0092] Compared with ordinary foam concrete wallboards, the lightweight alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wallboard obtained in Example 2 has improved thermal insulation effect, with a thermal resistance value increased by 10% and an air permeability reduced by 12%. The thermal conductivity of foam concrete is usually between 0.06-0.28W / (MK), which is much lower than the thermal conductivity of ordinary concrete. The glass fiber three-dimensional fabric further enhances the thermal insulation effect of foam concrete. Glass fiber has excellent heat resistance and extremely low thermal conductivity, which can effectively prevent the transfer of heat. At the same time, the fiber spacing of the glass fiber three-dimensional fabric is only 5mm, which can also isolate heat and reduce heat transfer. The detection method refers to GB / T 23451-2009 "Lightweight partition board for construction".

[0093] Comparative Example 1

[0094] The thickness of the outer panel 1 and the inner panel 6 are both 6mm, the outer panel 1 is made of bamboo fiberboard, the inner panel 6 is made of magnesium straw ecological board, the thickness of the glass fiber three-dimensional fabric 4 is 25mm, and the single-layer three-dimensional fabric. The thickness of the adhesive layer 2 is 3mm, and the specific preparation method is as follows:

[0095] S1. Preparation of foamed concrete

[0096] S11. Determine the composition and proportion of foamed concrete according to relevant national standards for foamed concrete;

[0097] S12, making foam of foamed concrete, the basic components are 0.2kg foaming agent, 12kg water, 0.25kg sodium oxalate, 1.1kg water glass, processed in a foaming machine, and a plant-based composite cement foaming agent (Jiukun Building Materials FP-50) is mixed with water in a mass ratio of 1:60 in the foaming pulping stage to prepare the foam for standby use;

[0098] S13, prepare mortar, basic components, by weight, 1 part of cement, 3 parts of sand, 0.9 parts of water, 0.2 parts of fly ash and 0.2 parts of slag, stir and mix well to obtain mortar;

[0099] S14, add the prepared foam to the mortar and mix thoroughly, stir for 120s, pour into the mold after mixing, shake and smooth, cover with plastic wrap and place in a 20±2° environment for curing, the bulk density of alkali-activated foam concrete 5 is 135kg / m 3 ;

[0100] S2. Preparation of sandwich layer 3

[0101] S21, preparing an 8-shaped glass fiber three-dimensional fabric with a thickness of 25 mm, wherein the spacing between two adjacent core yarns is 5 mm;

[0102] S22, fixing the 8-shaped glass fiber three-dimensional fabric on a stretching pedestal, horizontally stretching both sides of the three-dimensional fabric on the stretching pedestal, and applying a pre-tensioning force of 10% of the ultimate tensile bearing capacity of the 8-shaped glass fiber three-dimensional fabric to the fabric;

[0103] S23, prepare a mold of 3000 mm × 600 mm × 90 mm, place the 8-shaped glass fiber three-dimensional fabric with pre-tightening force applied therein, pour the foam concrete prepared in S1, and cure for 28 days;

[0104] S3, bonding sandwich layer 3, inner panel 6, and outer panel 1

[0105] S31, apply 1.5 mm polyurethane emulsion glue on the surfaces of the sandwich layer 3, the inner panel 1 and the outer panel 6, and adhere the sandwich layer 3 between the inner panel 1 and the outer panel 6, and press and fix them into one body;

[0106] S32, after solidification and hardening, demoulding is performed to obtain a single-layer glass fiber three-dimensional fabric alkali-activated foam composite material wall panel.

[0107] In Comparative Example 1, there is only a single layer of three-dimensional fabric, and the load-bearing capacity is significantly reduced. Relative slip occurs between fibers, which reduces the strength, stiffness and impact resistance of the fabric that enhances the overall structural stability. The bending bearing capacity test is conducted on it with reference to GB / T23451-2009 "Lightweight partition boards for construction", and the strength is expected to be reduced by 22%; alkali-activated foam concrete is not used, and ordinary foam concrete is used to fill the internal structure. It is observed from the durability test that the bending bearing capacity is reduced by 10% compared with alkali-activated foam concrete, and the overall durability is reduced.

[0108] The above description is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. Alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wallboard, characterized in that: It comprises an outer panel (1), an inner panel (6), a sandwich layer (3) between the outer panel (1) and the inner panel (6), and an adhesive layer (2) respectively connecting the inner panel (1), the outer panel (6) and the sandwich layer (3); The sandwich layer (3) is composed of a glass fiber three-dimensional fabric (4) and alkali-activated foam concrete (5) filled in the gaps of the glass fiber three-dimensional fabric (4); the glass fiber three-dimensional fabric (4) is a double-layer 8-shaped glass fiber three-dimensional fabric; and the glass fiber used in the glass fiber three-dimensional fabric (4) is alkali-resistant glass fiber.

2. The alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wallboard according to claim 1, characterized in that: The outer panel (1) and the inner panel (6) are respectively made of ecological boards, and the materials of the outer panel (1) and the inner panel (6) are different. The ecological boards are bamboo fiberboards or magnesium straw ecological boards.

3. The alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite wallboard according to claim 1, characterized in that: The thickness of the outer panel (1) and the inner panel (6) are 9-12 mm respectively; And / or, the thickness of the adhesive layer (2) is 2-5 mm; And / or, the thickness of the sandwich layer (3) is 45-50 mm.

4. The alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite wallboard according to claim 1, characterized in that: The material of the adhesive layer (2) is polyurethane adhesive.

5. The alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite wallboard according to claim 1, characterized in that: The glass fiber three-dimensional fabric (4) is composed of three layers of parallel glass fiber cloth and a plurality of core column yarns, wherein the core column yarns are fixedly connected to two adjacent layers of glass fiber cloth, and the core column yarns between the two adjacent layers of glass fiber are evenly distributed, and the glass fiber cloth is woven from warp yarns and weft yarns, and the core column yarns are in an 8-shape along the weft direction and in a 1-shape along the warp direction.

6. The alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite wallboard according to claim 5, characterized in that: The distance between two adjacent core yarns is 4-5 mm.

7. The alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite wallboard according to claim 1, characterized in that: The glass fiber three-dimensional fabric (4) is integrally formed.

8. The alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite wallboard according to claim 1, characterized in that: The glass fiber three-dimensional fabric (4) is pre-shaped by using polyurethane resin.

9. The alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite wallboard according to claim 1, characterized in that: The raw materials of the alkali-activated foam concrete (5) include: foam and mortar; The volume of the foam accounts for 25%-30% of the total volume of the alkali-activated foam concrete, the bubble size of the foam is 0.5-1.0 mm, and the density of the foam is 80-100 kg / m 3 The bulk density of alkali activated foam concrete is 135-150kg / m 3 ; The mortar consists of 4wt%-6wt% of sodium hydroxide, 9wt%-12wt% of water glass, 52wt%-58wt% of sand, 10wt%-15wt% of fly ash, 14wt%-18wt% of slag and 5wt%-11wt% of water.

10. The method for preparing the alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite wallboard according to any one of claims 1 to 9, characterized in that: Here are the steps: S1. Preparation of alkali activated foamed concrete (5) S11, preparing foam according to the formula of foam concrete; S12, stirring and mixing sodium hydroxide, water glass, sand, slag, fly ash and water to obtain mortar; S13, adding foam to the mortar and stirring evenly to obtain alkali-activated foam concrete (5); S2. Preparation of sandwich layer (3) S21, preparing a three-dimensional glass fiber fabric (4); S22, stretching both sides of the three-dimensional glass fiber fabric (4) to apply a pre-tensioning force of 10%-15% of the ultimate tensile bearing capacity of the three-dimensional glass fiber fabric (4); S23, placing the glass fiber three-dimensional fabric (4) after the pre-tightening force is applied in a mold, pouring the alkali-activated foamed concrete (5) prepared in S1, and curing for 28-35 days; S3, bonding the inner panel (1), the outer panel (6) and the sandwich layer (3) S31, applying adhesive to the surfaces of the sandwich layer (3), the inner panel (1) and the outer panel (6), and bonding the sandwich layer (3) between the inner panel (1) and the outer panel (6), and pressing and fixing them into one body; S32, curing for 28-35 days, removing the mold after solidification and hardening, and obtaining the alkali-resistant glass fiber three-dimensional fabric alkali-activated foam composite material wallboard.

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